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FreeTier compute - difference between Global-DataTransfer-Regional-Bytes and Global-DataTransfer-Out-Bytes

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Hello, I've created a FreeTier account and started a small EC2 VM in that account. And I've just received an email informing me that some usage inside that FreeTier are at 85% of the limits. So, I've checked the AWS Free Tier console, and I can see: AWS Data Transfer 1.0 GB are always free per month as part of AWS Free Usage Tier (Global-DataTransfer-Regional-Bytes) and AWS Data Transfer 100.0 GB are always free per month as part of AWS Free Usage Tier (Global-DataTransfer-Out-Bytes) The first one is the culprit. It is 100%, with an MTD forecast at 129%. The second one is 0.03%

But I can't find a clear explanation of the difference between the two. I don't know what I did with that VM (or the traffic) to reach 100% of Global-DataTransfer-Regional-Bytes, and I really don't understand why "Global-DataTransfer-Regional-Bytes" (note the -Regional-) is more limited than the Global-DataTransfer-Out-Bytes (no -Regional-), as I would have bet that something Regional (local ?) would be less likely to be constrained. Thanks for any help you can provide me. Regards,

Topics
Cloud Financial Management
Tags
AWS Billing
Language
English
as2917
asked 6 months ago269 views
1 Answer
0

Hello, DataTransfer-Regional-Bytes refers to traffic going between availability zones in the same region. The Global portion means that it's the sum of that usage across all regions. By contrast DataTransfer-Out-Bytes is data leaving an AWS region and going out over the internet--an apache host serving web traffic for example.

It's hard to speculate what's driving the traffic on your EC2 instance, but this blog post [1] may be helpful in determining that. You may also want to use some network monitoring tools such as iftop as well. It's important to note that while there's traffic going between AZs in the same region, the destination doesn't necessarily have to be a resource you control. If you signed up for a free trial from another software provider for example you would be charged for network traffic between your host and theirs if they were in different AZs of the same region.

[1] https://aws.amazon.com/blogs/networking-and-content-delivery/understand-aws-data-transfer-details-in-depth-from-cost-and-usage-report-using-athena-query-and-quicksight/

AWS
Mike S
answered 6 months ago

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